[asterisk-dev] Data Modem calls passthrough

[Greg Varga]

We have a similar setup here working...  We connect a Asterisk server to 
a T1 incoming line.  We then connect a second T1 from Asterisk to the 
Dialup Modem system (this case a Ascend Max4000).

All we had to do is to fix the Echo Canceler being turn on when the call 
connect. I still have to visit that part of the code before I submit a 
patch, but basically when a call connects, EC gets turned on in a bunch 
of places, even after the "If Bridged, and config says no EC, then don't 
EC!" check happens.  So we removed the Turn_EC_on code after the 
EC_when_bridged check takes place and everything works great on voice 
calls and data calls.

--Greg

Kannaiyan Natesan wrote:
> I don't think asterisk supports any of the application codec as of
> now. All the codecs inside is only for voice. Data will not flow
> reliably.
>
> Regards,
> Kannaiyan
>
> On 9/4/06, Anton <anton.vazir at gmail.com> wrote:
>> Does anyone know is possible to pass DIALUP modem calls
>> over, through asterisk? Nothing extra needed I think, say
>> asterisk is in-between of 2 telcos, connected over E1 from
>> both sides. Modem calls is already DATA, so will it work,
>> or asterisk will make some sort of codec resampling, so
>> original E1 data will be lost?
>>
>> Regards,
>> Anton.
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